Art Shapiro, distinguished professor of evolution and ecology at UC Davis, holds the first cabbage white butterfly of 2015. He collected it Jan. 26 in West Sacramento, Yolo County. (Photo by Kathy Keatley Garvey)

Art Shapiro, distinguished professor of evolution and ecology at UC Davis, holds the first cabbage white butterfly of 2015. He collected it Jan. 26 in West Sacramento, Yolo County. (Photo by Kathy Keatley Garvey)